Which statement about selective gene transcription in eukaryotes is not true?
a. Transcription factors can bind at a site on DNA distant from the promoter.
b. Transcription requires transcription factors.
c. Genes are usually transcribed as groups called operons.
d. Both positive and negative regulation occur.
e. Many proteins bind at the promoter.
Answer: c. Genes are usually transcribed as groups called operons.
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Urine formed by a kidney collects in the ____ before being drained from the kidney by the ____ and transported to the _____.
Fill in the blank(s) with the appropriate word(s).
How would you go about streaking a plate for isolation? Why do you heat the loop and when do you do it?
What will be an ideal response?
What unit of measure is most appropriate for expressing the size of bacteria?
A. nanometer B. picometer C. milimeter D. micrometer